Temat: direct shear - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effects of Contamination with Gasoline and Diesel Oil on Shear Strength of Coarse Grained Soil
Autorzy:: Brzeziński, Bartłomiej
Olchawa, Andrzej
Tematy:: motor fuels
coarse-grained soil
shear strength
direct shear tests; Pokaż więcej
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:: https://bibliotekanauki.pl/articles/27315755.pdf Link otwiera się w nowym oknie
Opis:: he paper presents research results into the influence of motor fuels on the shear strength of coarse-grained soil. The soil was classified following the unified soil classification system PN-EN ISO 14668-1 as saGr. The soil samples were artificially contaminated with three percentage ratios of motor fuels 5, 7.5 and 10% in relation to the dry mass of the soil skeleton. The test results have shown that motor fuel contamination significantly impacts the tested soil's mechanical properties. Increasing the content of impurities causes a significant decrease in shear strength parameters. For soil contaminated with 5%, 7.5% and 10% of motor fuel, i.e. gasoline or diesel, the angle of internal friction decreased by 8%, 15% and 20%, respectively. Along with the impurities increase, the soil's ultimate bearing capacity, calculated following EC-7, showed a dramatic decrease. The decrease was 40%, 57% and 66% respectively.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Determination of the friction coefficients of chestnut (Castanea sativa Mill.) sawn timber
Autorzy:: Villar-Garcia, J.R.
Vidal-Lopez, P.
Corbacho, A.J.
Moya, M.
Tematy:: wood
mechanical properties
friction coefficient
direct shear test; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2082657.pdf Link otwiera się w nowym oknie
Opis:: This work provides the values of both the static and the kinetic friction coefficients for chestnut (Castanea sativa Mill.) of Spanish origin. Knowledge concerning these coefficients has its main application in the study of agroindustrial structures and machinery with timber members in contact. This determination was developed taking into account the timber anisotropy to establish surfaces and directions of slipping. A modified direct shear test device was used to conduct the tests and reproduce the tribological system. This procedure was functional and reliable and considered suitable for standardizing the friction measurement between timber surfaces, since this device is widely distributed in geotechnical and materials laboratories and the European codes do not specify a procedure or device to carry it out. The average values obtained were 0.46 for the static coefficient and 0.33 for the kinetic one, without considering the surfaces and directions of slipping. These values ranged between 0.36 and 0.55 for the static friction coefficient and between 0.28 and 0.39 for the kinetic friction coefficient depending on the direction considered and also taking into account the anisotropy of the timber. A good correlation was obtained between both coefficients, thus allowing for the estimation of the kinetic coefficient from the static one.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Shear strength of compacted Chlef sand: effect of water content, fines content and others parameters
Autorzy:: Bouri, Djamel
Krim, Abdallah
Brahim, Abdelkader
Arab, Ahmed
Tematy:: fines content
water content
direct shear test
friction angle
cohesion; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178905.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a laboratory study of the combined effect of the water content and fines content on the mechanical behaviour of Chlef sand in a medium dense state (RD = 65%) and dense state (RD = 80%). Several mechanical parameters were evaluated such as shear strength, cohesion and friction angle at different water content w = 0, 1, 2 and 3% and different fines content F_c = 0, 10, 20, 30 and 40%. The test results showed that the shear strength of Chlef sand decrease with the increase fines content F_c = 0 to 40%, our tests result also showed that the water content has a significant influence on the shear strength which decreases with the increase in the water content w = 0 to 3%. The fines content and the water content have a significant influence on the mechanical parameters c and ɸ. Cohesion increases with the percentage of fines and decreases with the increase of the water content while the friction angle decreases with the increase the fines content and the water content.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Scale effect in direct shear tests on recycled concrete aggregate
Autorzy:: Soból, E.
Sas, W.
Szymański, A.
Tematy:: direct shear test
recycled concrete aggregate
scale effect
box size; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178477.pdf Link otwiera się w nowym oknie
Opis:: The depletion of natural resources is forcing researchers to explore the possibilities of new aggregates, such as recycled concrete aggregate (RCA). In this article, the mechanical properties and the influence of the size of the direct shear box on the obtained parameters were examined. The study was conducted in two apparatus: medium (120 × 120 mm) and large (250 × 250 mm). In each of these devices, a total of 6 tests were performed: 3 for dry sample and 3 at optimum moisture content. From the results, the conclusions described below have been drawn.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: 3D DEM simulations of basic geotechnical tests with early detection of shear localization
Autorzy:: Grabowski, Aleksander
Nitka, Michał
Tematy:: direct shear
granular material
discrete element method
localization
grain level; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1845158.pdf Link otwiera się w nowym oknie
Opis:: This paper deals with elementary geotechnical tests: triaxial and direct shear of cohesionless sand using the discrete element method (DEM). The capabilities of the numerical DEM code are shown, with a special focus on the early phenomena appearance in localization zones. The numerical tests were performed in 3D conditions with spherical grains. Contact moments law was introduced due to simulate not perfectly round sand grains. The influence of different physical parameters was studied, e.g. initial density or confining pressure. The sieve curve corresponded to the Karlsruhe sand [1]; however, in some tests, it was linearly scaled. Special attention was laid on the behaviour of the sand grains inside localization, e.g. rotation, porosity, fluctuations, etc. and forces redistribution. Emphasis was given on the pre-failure regime and early localization predictors.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effect of randomly distributed polypropylene fiber reinforcement on the shear behavior of sandy soil
Autorzy:: Benziane, Mehdi Missoum
Della, Noureddine
Denine, Sidali
Sert, Sedat
Nouri, Said
Tematy:: sand
direct shear box tests
polypropylene fibre
shear strength
normal stress
relative density; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178213.pdf Link otwiera się w nowym oknie
Opis:: The inclusions of geosynthetic materials (fibers, geomembranes and geotextiles) is a new improvement technique that ensures uniformity in the soil during construction. The use of tension resisting discreet inclusions like polypropylene fibers has attracted a significant amount of attention these past years in the improvement of soil performance in a cost-efficient manner. A series of direct shear box tests were conducted on unreinforced and reinforced Chlef sand with different contents of fibers (0, 0.25, 0.5 and0.75%) in order to study the mechanical behavior of sand reinforced with polypropylene fibers. Samples were prepared at three different relative densities 30%, 50% and 80% representing loose, medium dense and dense states, respectively, and performed at normal stresses of 50, 100 and 200 kPa. The experimental results show that the mechanical characteristics are improved with the addition of polypropylene fibers. The inclusion of randomly distributed fibers has a significant effect on the shear strength and dilation of sandy soil. The increase in strength is a function of fiber content, where it has been shown that the mechanical characteristics improve with the increase in fiber content up to 0.75%, this improvement is more significant at a higher normal stress and relative density.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Shear Strength Enhancement of Cemented Reinforced Sand: Role of Cement Content on the Macro-Mechanical Behavior
Autorzy:: Boutouba, Kheira
Benessalah, Ismail
Arab, Ahmed
Henni, Ahmed Djafar
Tematy:: cemented reinforced sand
direct shear test
water content
curing time
dilatant character; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178198.pdf Link otwiera się w nowym oknie
Opis:: Sands reinforced by hydraulic binders (cement) have constituted in recent decades a major asset for the expansion of several areas of engineering. The mechanical behavior of sand-cement mixtures has undergone some controversies studied on the Chlef sand. In this paper, we present an experimental study to investigate the mechanical behavior of a sandy soil reinforced by a hydraulic binder (cement), using the direct shear apparatus emphasizing on the shear strength characteristics and the vertical deformation variation of cemented reinforced sand. The parameters used in this study are mainly: relative density (Dr = 80%), normal stress (σn = 100, 200, 400 kPa), water content (3, 7 and 10%), cement content (2.5, 5, 7.5 and 10 %) and cure time (7, 14 and 28 days). The experimental results show that the mechanical characteristics in terms of internal cohesion (C) and internal frication angle (φ) give a better mechanical performance with the binder inclusion, and the cure conditions play an effective role on the improvement of the shear strength. This result also showed that 10% of the cement content gave us a maximum value of shear strength and an optimal influence on the mechanical characteristics. The addition of cement not only improves the shear strength of soil, but also provides diversity in the resistance against the deformations imposed load, which can be established by a dilatant character.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Evaluation of geosynthetic interface friction at low normal stress: comparison between two different test procedures
Ocena oporów tarcia pomiędzy geosyntetykami podczas występowania małych naprężeń normalnych: porównanie dwóch metod badawczych
Autorzy:: Pavanello, P.
Carrubba, P.
Moraci, N.
Tematy:: geosynthetic
interface friction
frictional resistance
shear resistance
shear test
direct shear test
horizontal shear test
normal stress
inclined plane; Pokaż więcej
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:: https://bibliotekanauki.pl/articles/28765739.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A laboratory investigation on shear strength behavior of sandy soil: effect of glass fiber and clinker residue content
Autorzy:: Bouaricha, L.
Djafar Henni, A.
Lancelot, L.
Tematy:: direct shear test
glass fibers
clinker residue
peak shear stress
sand
normal stress
cohesion
frictional angle; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178431.pdf Link otwiera się w nowym oknie
Opis:: A study was undertaken to investigate the shear strength parameters of treated sands reinforced with randomly distributed glass fibers by carrying out direct shear test after seven days curing periods. Firstly, we studied the fiber content and fiber length effect on the peak shear strength on samples. The second part gives a parametric analysis on the effect of glass fiber and clinker residue content on the shear strength parameters for two types of uniform Algerian sands having different particle sizes (Chlef sand and Rass sand) with an average relative density Dr = 50%. Finally, the test results show that the combination of glass fiber and clinker residue content can effectively improve the shear strength parameters of soil in comparison with unreinforced soil. For instance, there is a significant gain for the cohesion and friction angle of reinforced sand of Chlef. Compared to unreinforced sand, the cohesion for sand reinforced with different ratios of clinker residue increased by 4.36 to 43.08 kPa for Chlef sand and by 3.1 to 28.64 kPa for Rass sand. The feature friction angles increased from 38.73° to 43.01° (+4.28°), and after the treatment, clinker residue content of soil evaluated to 5% (W_RC = 5%).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Symulacja komputerowa parametrów wytrzymałościowych gleby na bazie modeli Janosi-Hanamoto oraz Coulomba-Mohra
The computer simulation of the soil strength parameters on the basis of the Janosi-Hanamato and the Coulomb-Mohr models
Autorzy:: Błaszkiewicz, Z.
Szafarz, A.
Tematy:: gleba
ścinanie bezpośrednie
model
program komputerowy
aproksymacja
soil
direct shear test
computer program
approximation; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Rolniczej
Powiązania:: https://bibliotekanauki.pl/articles/287587.pdf Link otwiera się w nowym oknie
Opis:: W pracy przedstawiono program komputerowy do wyznaczania parametrów wytrzymałościowych gleby i symulacji zależności naprężeń ścinających od poziomego odkształcenia gleby obliczanej na bazie modeli Janosi-Hanamoto i Coulomba-Mohra. W badaniach symulacyjnych wykazano, że modele dobrze opisują nowe zależności naprężeń ścinających od poziomego odkształcenia gleby uzyskane metodą zmodyfikowaną w aparacie bezpośredniego ścinania przy narastających naprężeniach normalnych. Testy zostały przeprowadzone dla wilgotności gleby 4% wag. i dla maksymalnych naprężeń normalnych 70 i 130 kPa.
The paper presents a computer application used to determine soil strength parameters and to simulate relations between shearing stresses and horizontal soil strain, computed using the Janosi- Hanamoto and Coulomb-Mohr models. Simulation tests have proven that these models characterize well new relations between shearing stresses and horizontal soil strain, obtained using the modified method in a direct shear apparatus at growing normal stress values. The tests were performed for soil humidity 4% by weight, and for maximum normal stress values of 70 and 130 kPa.
Dostawca treści:: Biblioteka Nauki

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